Device for continuously drying paper webs provided with areas of varnish



P. GANGLER DEVICE.FOR CONTINUOUSLY DRYING PAPER WEBS PROVIDED WITH AREAS OF VARNISH 2 Sheets-sheet 1 'Filed March 8, 1929 @dw @n n nmmwmm .m8 m im@ INVENTOR 5, www Mummy.

Dec. Z9, 1931. P. GANGLER DEVICE FOR CONTINUOUSLY DRYING PAPER WEBS PROVIDED WITH AREAS OF VARNSH Filed Maron s, 1929 2 sheets-sheet 2 mummy Parental Dec. 29, 1931 UNITED STATES PATENT OFFICE PAUL GANGLER, 0F ESSLINGEN, GERMANY, .ASSIGNOR TO THE FIRE FR.- B MASCHINENFABRIK-AKTIENGESELLSCHAFT, 0F STUTTGART-CANNSTATT, GEBKAN'Y DEVICE Pon commUorrsLY Darme PAPER wEBs PROVIDED wrrn AREAS or vamnsn Application led March 8, 1929,- Serial No. 345,335, and in Germanyrltarch 17, 1928.

The invention relates to improvements in devices for continuously drying areas of Varnlsh apphed to webs of paper. Such webs ot paper are, for instance, used to manufacture in a continuous operation dried hard, i. e. so that the dried Varnish is no longer adhesive.

The paper web thus treated may then be directly fed into further machines adapted to convert it into 'envelopes or be wounc up into a reel to be stored until required.

' ln the accompanying drawings, two embodiments of the invention are shown by way of example. i

In the drawings are Fig. 1, a side-elevation of the improved device,

Fig. 1, a part-of Fig. 1 in different position, I 4

Fig. 2, a plan of Fig. 1, but with the paper web omitted for thesake of clearness, and

Fig. 3, a side-elevation of a modilication.

Referring to Fig. 1 of the drawings, it will be observed that the web of paper coming from the varnish applying or window producing machine is introduced into the improved drying device at the left-hand side frombelow. 0n the outside of the-web 1 areas of varnish 1 are provided which are to be dried in the device. The web rests upon a quadrant 24 provided with lateral guides and is in the form of spirals guided over sets of rollers through the frame-like drying casing in such a manner that it is supported 'on its inner side only, where no varnish has been applied lto the paper. The web is passed rst over the rollers 4a, 5- a, then in a second spiral over the rollers 4", 5"- in a third spiral over the rollers 4c, in a fourth spiral over the rollers 4, 5d-9d, and in a fifth spiral over the rollers 4", 5"- From the roller 9? the paper web 1 'passes over the roller 10 and thenissues from' the casing 50 over a roller 11 and then forms a loosely hanging loop 1', whereupon the web 1 is again caught in a manner described later on and after a few turns guided to a reel or other winding up device. This procedure serves to give the web time to cool down by the radiation ofthe heat absorbed in the casing into the ambient air or by the aid of artificial means, such as fans, blowers or the like, so that the varnish producing the windows becomes hard after the drying and the window does not stick to the paper when the web is wound up into a reel. 'lhe loop l also serves to equalize any speed fluctuations. A further object of the loop is to align the web again should it have deviated laterally during its passagethrough the casing, which in view of the considerable length can never be avoided altogether. In this way it is possible to obtain reels which are correctly wound up at both sides.

The guide rollers 5- 7- 8*-8, 9-9 and 10 inthe drying casing run idle. 'lhey are entrained by the friction of the web 1. The rollers 'ia- 4 are driven at equal speeds by means of spur wheels 4"-4 mounted on their spindles and coupled by tlie transmission wheels 4"-4d. One of the spindles, for instance the spindle 4' of the roller 4d, is driven from outside by the belt 31 and the pulley 32, for example. To impart to the web 1 within the casing so much draw or tension that it deviates laterally from its proper path within the permissible limits only, the drive of the rollers 6*-6 in the right-handl upper corner of the drying casing, which may be effected for instance by suitable pulleys, is so designed that the circumferenti al speeds of these rollers diminish stepwise from the inside towards the outside. The pulley 33 mounted on the spindle 4' drives the pulley 36 on the spindle 35 by means of the belt 34. On the axles of the rollers (6e are mounted the grooved belt pulleys 6""-6e, and on the axles 35 is mounted the grooved drum 37 with 5 grooves, which correspond with the pulleys 6"-6. By the round straps (SW-6 are driven the rollers 6-6,' and the diameters of the pulleys iential speed of the roller 6.

6*-6 are so dimensioned that the circumferential speed of the roller 6 is slightly higher than the circumferential speed of the rollersl 4-4 revolving at the same circumferential speeds. The c1rcumferentia1 speed of the roller 6b is again slightly higher than that'of the roller 6", that of the roller 6c a ain higher than that of the roller'", that of t e roller 6d again higher than that of the roller 6c, and that of the roller 6e again slightly higher than the circumferential speed of the roller 6d. The above mentioned roller 11 is driven from the pulley 41 mounted on the driving spindle 4 by means of the strap 11 and the pulley 11 mounted on the spindle of the roller 11 in such a manner that its circumferential speed is again slightly higher than the circumfer- For increasing the circumferential friction, a friction roller 11 may idly rest upon the roller 11. In a similar way, friction rollers may ride upon the rollers 6*-6" to increase the circumferential friction, if desired. In this manner, the paper web 1 passes under uniform tension through the drying casing, without the danger that the paper may be torn` by an excessively strong pull being exerted upon it.

In the modification of the device illustrated in Fig. 3, the web of paper 1 is guided through the drying casing 5()a in long loops ill-51". These loops are supported by the guide rollers 52-52f, the spindles of which are driven by the sprocket wheels 54--54t mounted upon them, by means of the chain 55. For driving the s indle of the roller 52l there is 'provided a. be t 56 and the pulley 57 mounted on the spindle of the roller 52a. To obtain the necessary friction, the idle friction rollers 53- f ride upon the guide rollers 52-52f.

To prevent swin of the loops 51-51 when the web 1 runs thro h the dryin casing the are supporte on the msi e by special gui e ways which may, vfor instance,

consist of the round rods 60.

For drying the windows or transparent areas roduced by the application of the varnish) to the web 1, there are provided in both embodiments of the device electrical heating elements, for instance, the number, arrangement and heating action of which may be regulated so that the varnish is dried to the desired extent. In Fig. 1 there are, for instance, provided a plurality of heatingelethe exception of the slots for introducing and l withdrawingthe web 1, and air may either be blown into the casin as indicated at 50 in Figulre 1 or be ejected rom it as indicated at lidfin Figure 1. The casin may, however, also be left open, and a num er of propellers or fans may be provided to effect the desired circulation of the air for instance through the pipes 52 and 53 indicated in Figure 3. The arrangement of the heating elements between the individual webs takes care that the heat generated by the said elements is almost exclusively imparted to the web and to the air surrounding the web fromi'botli sides, so that the heating action attains a high efficlency.

The reeling and reel changing device illustrated in Figs. 1 and l* may be used for both embodiments shown. It will be readily understood that the dryin device when first started will attain only a lr some time the steady work'giving a good result. This reeling and reel changing device is, therefore, so designed that the reeling of the paper web, the removal of the finished reel and the transfer to a new reel take place in such a way that during these operations the web can run continuously and at unchanged speed through the casing, so that the steadiness of the service once attained will not be interrupted.

As already described, the web 1 issuing from the casing forms the loop 1. The righthand portion of the loop is turned into the horizontal plane by means of a curved track upon which thel web 1 gets rest by its own gravity. In the example illustrated, the curved track consists of circular rods 12, which at their ends are loosely supported in the rails 13, 13b. The accurate lateral position of the paper webil is ensured by the lateral guide bars 13, 13". To obtain the tension necessary for winding up the web, a brush 25 or the like may be provided, if desired, which increases the friction of the web 1 along the curved track. The web 1 is led over the rollers14, 15, 15,'then over the roller 16, which is adapted to revolve upon the spindle 16", and over the roller 15". which is journaled in the arms 17a', 17h of the connectin links 17a, 17", and is finally laid aroun therol1er 18 conected with the spindle 18, which in its turn is with its ends journaled in the said connecting links 17, 17". The links 17 a, 17b are loosely rotatable on the spindle 16a. The roller 18 or the spindle 18a respectively is, for instance, driven by a belt drive 'in the following manner A 'pulley 42 mounted on the spindle4, Fig. 2, drives the intermediate shaft 44Y by means of the belt 43, from which the spindle .16il is driven by means of the belt'4'5 andthe pulley.' 46". By means of the chain wheel 46 keyed to the spindle 16, the chain 47 and the chain wheel 48 mounted on the spindle18, the'drive is transmitted to the spindle I8, whereby Weight, the web 1 is fed forward, an

without interfering with the drive, the roller 18 can be moved up and down around the spindle 16a. s y. The reeling of the web is effected by means of the spindles 19, 19", 19, which carry in the well-known manner the paper tubes 20" 2Gb, 20, upon which the paper web 1 is to be' wound up in succession. The spindles 19, 19", 19c are-removably and rotatably journaled in the two side spiders 22, 22", which are keyed to the spindle 21. The spindle 21 is `adapted to revolve in the two end pedestals 23, 23h. In Fig. 1, the reeling spindle 19a just occupies its working position. At the initial starting of the reeling, the web 1 is led unto the roller 16' in the manner described and passed around the raised, but for the time being still stationary, roller 18. The pa r tube 20a has been provided with some g ue before it has been placed into the working position. N ow the roller 18 is loweredinto the position indicated by dotted lines upon the tube '20 and rotated by switching in the drive. The revolving roller 18 puts 'the tube 2()a in rotation due to the friction set u by its d as its end isv glued tothe tube 20, it is Wound up on the tube. The circumferential speed of the paper reel thus produced remains constant owing to the nature of the drive. As theA diameter of the reel 2 increases, it gradually raises the roller 18. When the reel 2 has attained the desired diameter, the spindle 21 is turned through an angle of 120 in a clockwise direction, either 'by hand or by a suitable mechanism which is automatically set into operation if the reel 2 has got the desired diameter, for instance by means of a feeler operated by the reel and controlling the operation of the turning device for spindle 21. In this way, the roller 18 is lowered and comes automatically to rest upon the tube 20" already previously provided with glue. This is the position illustrated in Fig. 1a. The web is, therefore, stickd instantly to the tube 20", and the winding up of a new paper reel on the tube 2Ob is started at once. By the strong pull exerted thereby to the web, the latter will be severed automatically between the reel 2 and the tube 20",-for instance at the point -27 in Fig. 1a. Of course, the web may be also severed by hand or by a suitable cutting mechanism. The reel 2 can be finished at leisure and removed from thel device, and the spindle 19 can be rovidedwith a fresh paper tube 20, If the paper reel on the paper tube 20b has nearly attained its desired diameter, the paper tube 20c is provided with glue. At the proper movement, the same cycle of the paper reel change is then repeated.

To prevent that in consequence of any slip of lthe paper web 1 the loop 1 will become excessively lar e'or small, provisions have been made to c ange the speed of the intermediate shaft 44 accordingly, which may, for instance, be elected by providing tapering belt drums on\ the spindles 4 and 44 and by a corresponding displacement the belt 43 on the said drums.

Instead of winding the web into a reel for storage, it may from the herein described device be directly conducted to the machine for further treatment, for instance to a machine for manufacturing envelopes with windows or similar wrappers.

Various changes may be made Without'departing from the spirit of my'invention.

I claim as my invention:

1. In a device for continuousl drying paper webs provided with areas o varnish, in combination, a drying chamber, means for guiding a web of paper within said chamber in spirals running from outside towards ythe inside, said guidlng means comprising sets of driving rollers and sets of idle rollers, and means to turn the driving rollersof certain sets with various speeds increasing from the outside towards the inside.

2. In a device for continuousl drying paper webs provided with areas o varnish, 1n combination, a drying chamber, means for `guiding a web of paper within said chamber in spirals running from outside towards the inside, said guiding means comprising sets of driving rollers and sets of idle rollers, a sideways guiding track in front of said chamber adapted to catch the paper web and lead it to the outermost roller of the first set of driving rollers runnin at equal speeds and arranged adjacent to t .e entrance of the said web, and means to drive the rollers of a subsequent set of driving rollers so that the outermost roller is revolved aster than the rollers of the said first set of driving rollers and the remaining rollers of said sub-I sequent set of driving rollers are revolved signature.

. PAUL GANGLER. 

